<!DOCTYPE HTML>
<html>
<body>
<!--HTML标题 h1到h6-->
<h1>This is heading 1</h1>
<h2>This is heading 2</h2>
<h3>This is heading 4</h3>
<h4>This is heading 4</h4>
<h5>This is heading 5</h5>
<h6>This is heading 6</h6>

<!--HTML 段落-->
<p>This is a paragraph</p>

<!--HTML链接-->
<a href="https://www.baidu.com">This is a link</a>

<!--HTML图像-->
<img src="https://www.w3school.com.cn/i/eg_w3school.gif" width="104" height="142"/>
</body>
</html>
